小波去噪方法在开关柜故障检测中的应用
发布时间：2018-11-12 14:40
【摘要】：中压开关柜故障检测中,传感器的输出信号中往往包含大量的噪声干扰,特别是在故障发展的早期阶段。小波变换是常用的降噪处理方法,在高压设备局部放电检测中有很长时间的研究历史。首先介绍了小波变换原理,并对其与傅里叶变换的区别进行了分析,同时介绍了常用的小波降噪的实现方法;其次,搭建了一套开关柜故障测试平台,采用一种简单、实用的微分电场传感器实现了对绝缘子沿面电晕放电信号的测量,并采用一种商用高频CT进行对比测量;最后,基于文中所述小波去噪的实现方法,对两种传感器的输出信号进行了小波去噪处理,原始信号中80 MHz以上频带的干扰信号在小波去噪后得到了有效抑制,小波去噪的效果显著。
[Abstract]:In the fault detection of medium voltage switchgear, the output signal of the sensor often contains a lot of noise interference, especially in the early stage of fault development. Wavelet transform is a commonly used noise reduction method, which has a long history in the detection of partial discharge in high voltage equipment. Firstly, the principle of wavelet transform is introduced, and the difference between wavelet transform and Fourier transform is analyzed. Secondly, a fault test platform for switchgear is built. A simple and practical differential electric field sensor is used to measure the corona discharge signal along the insulator surface, and a commercial high frequency CT is used to measure the corona discharge signal. Finally, based on the method of wavelet denoising, the output signals of two kinds of sensors are de-noised by wavelet. The interference signals in the frequency band above 80 MHz in the original signal are effectively suppressed by wavelet de-noising. The effect of wavelet denoising is remarkable.
【作者单位】： 云南电网有限责任公司电力科学研究院;云南电力试验研究院(集团)有限公司;防灾科技学院;
【基金】：国家高技术研究发展计划(863计划)(2015AA050201)~~
【分类号】：TM591
本文编号：2327403
[Abstract]:In the fault detection of medium voltage switchgear, the output signal of the sensor often contains a lot of noise interference, especially in the early stage of fault development. Wavelet transform is a commonly used noise reduction method, which has a long history in the detection of partial discharge in high voltage equipment. Firstly, the principle of wavelet transform is introduced, and the difference between wavelet transform and Fourier transform is analyzed. Secondly, a fault test platform for switchgear is built. A simple and practical differential electric field sensor is used to measure the corona discharge signal along the insulator surface, and a commercial high frequency CT is used to measure the corona discharge signal. Finally, based on the method of wavelet denoising, the output signals of two kinds of sensors are de-noised by wavelet. The interference signals in the frequency band above 80 MHz in the original signal are effectively suppressed by wavelet de-noising. The effect of wavelet denoising is remarkable.
【作者单位】： 云南电网有限责任公司电力科学研究院;云南电力试验研究院(集团)有限公司;防灾科技学院;
【基金】：国家高技术研究发展计划(863计划)(2015AA050201)~~
【分类号】：TM591
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